National ads were off on weakness in technology, movie and auto categories. Retail was also down, and classified fell across the board drops in all three categories: real estate, help wanted and auto. At the Regional Media Group, ad revenue fell 8.1% to $28.2 million, with a decline in New England of 4% to $29.9 million. On the plus side, circulation revenue edged up 0.5% on gains at The New York Times and Internet ad revenue jumped 14.3%.